SkyDemo.apk should show thumbmails when offline

sky/sdk/lib/painting/box_painter.dart

Index: sky/sdk/lib/painting/box_painter.dart
diff --git a/sky/sdk/lib/painting/box_painter.dart b/sky/sdk/lib/painting/box_painter.dart
index 4ce567f51fba1d3bb3120105137806d7a49310c4..a8a92abf30f0cfa82a00f2fe1a16cce3b59b672b 100644
--- a/sky/sdk/lib/painting/box_painter.dart
+++ b/sky/sdk/lib/painting/box_painter.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:async';
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:sky' show Point, Offset, Size, Rect, Color, Paint, Path;
@@ -140,19 +141,18 @@ enum BackgroundRepeat { repeat, repeatX, repeatY, noRepeat }
 // to do animated images.
 
 class BackgroundImage {
-  final String src;
   final BackgroundFit fit;
   final BackgroundRepeat repeat;
   BackgroundImage({
-    this.src,
+    Future<sky.Image> image,
     this.fit: BackgroundFit.scaleDown,
     this.repeat: BackgroundRepeat.noRepeat
   }) {
-    image_cache.load(src).then((image) {
-      if (image == null)
+    image.then((resolvedImage) {
+      if (resolvedImage == null)
         return;
-      _image = image;
-      _size = new Size(image.width.toDouble(), image.height.toDouble());
+      _image = resolvedImage;
+      _size = new Size(resolvedImage.width.toDouble(), resolvedImage.height.toDouble());
       for (Function listener in _listeners) {
         listener();
       }
@@ -174,7 +174,7 @@ class BackgroundImage {
     _listeners.remove(listener);
   }
 
-  String toString() => 'BackgroundImage($src, $fit, $repeat)';
+  String toString() => 'BackgroundImage($fit, $repeat)';
 }
 
 enum Shape { rectangle, circle }